Lactose is a disaccharide (two monosaccharides joined together). to metabolize lactose, individuals require an enzyme known as lactase. what is true about this reaction? lactose is a disaccharide (two monosaccharides joined together). to metabolize lactose, individuals require an enzyme known as lactase. what is true about this reaction? the reaction causes reactants to be formed. the reaction causes bloating in individuals who have the enzyme. the reaction hydrolyzes the sugar. the reaction dehydrates the sugar.